Sankalan Dasgupta

I’m a Senior Software Engineer who builds accessible, real-time experiences and the scalable systems behind them. At P360, I’ve fully owned development across client, server, and database layers for a healthcare communication SaaS used by 20k+ doctors across 45+ countries.

I developed and deployed a config-driven tenant provisioning system with Node.js and Express.js that cut multi-tenant deployment time from a day to just 5 minutes. I orchestrated Terraform pipelines, provisioned Azure resources, and managed tenant data across PostgreSQL databases through a UI-driven workflow.

I migrated a real-time messaging system from Pusher to a microservices-based solution using Socket.io. With Node.js/Express.js and Zustand for client state, I optimized WebSocket connections—reducing message latency by 10% and improving scalability for 20k+ concurrent users—while delivering REST APIs for authentication, validation, and healthcare workflow business logic.

I also raised frontend quality and performance through code splitting, image compression with WebP, CSS containment, and eliminating render-blocking resources—resulting in a 10% higher Lighthouse score and better Core Web Vitals. I keep reliability high with Jest/Supertest, React Testing Library, and Playwright E2E tests (85% code coverage), plus CI/CD feature-flag rollouts, Dockerized environments, and technical documentation in Docusaurus for 100+ developers.